Improvement in foundry flask-clamps



N. PETERS, FHOTO-LIIMOGRAPNER, WASHINGTON D C N @tufted tttte @met @mite CHARLES-C. STEWART, OF V()l\TE Ol\l'l.A,.NEW YORK.

v Letters Patent No. 102,987, dated May 10, 1870.

` IMPROVEMENT IN FOUNDRY FLASK-CLAMPS.

The Schedule refuted to in these Letters Patent andmaking part of the same.

To all whom it may concern: i

-Be it known that'IL CHARLES O.STEWART, of Oneonta, in the -county of Otsego and State of New York,'l1ave invented a new and useful Improvement in lfouudry.Flask-Clamps, oi' which the following is a full, clear, audexa'ct description, reference being had to the accompanying drawing .forming part: of this specification, and in whichl Figure 1 represents a. side view of a fiask, in part, with my improvement applied toit; v

Figure 2,1m transverse 'section of the sa1ne,'vtal en as denoted by the line a: x, in iig. l; and t Figure 3, a side viewpt' the clamp detached. Similar letters of reference indicate corresponding parts. i 4 My improvement in clamps for foundry flasks consists iu a sliding attachment, under control of a rubber or other Suitable spring, oi' the hook or hooks which lock the sections ofthe flask together, whereby a more secure hold is obtained of said sections, and provision made against shrinkage or fwear of the sections; also, whereby the hook may be heldin any desired position, out of the Way when not in use.

Referring to the accompanying drawing* A represents the cope, B the body,...and C the bottom of a moulders ask.

D are the hooks in pivoted connection with the cope, and bitingrwheu closed under projections E, secured to the' bottom, such devices being duplicated or arranged on opposite sides of the flask.

Each hook, D, which is of eccentric form where it locksuuder the projection E, is hung to swing on a pivot, b, arranged to project from a side box, F, secured by screws to the side of the cope or one flask section, and receiving the `eye of the hook within it,- said'pivot b preferably, also, being made to enter. the side of the cope, to giveincreased steadiness. K

The eye c of the hook is of a slotted construction, to receive within itasliding box, d, which forms the bearing for the eye ofthe hook on the pivot b. This slot is made suficiently long in direction of the length of the hook to receive within it a rubber spring, e,

which serves to lift the hook,;so that when the latter is closed' under its catch or projection, E, said spring is compressed, and the hook thereby-made to est-ablish a firmer or more secure lock, and whereby pro-=` vision is made against shrinkage or wear oi the flask-sections loosening the hold of the clamp; lilce wise, whereby a sufficient friction is produced to hold4 the hook in any desired position, and out ot the way when not in use.

`What is here claimed, and desired to be secured by Letters Patent, is

The combination of the slotted hook D, the sliding box d, and the spring e, with the pivot b, thel whole being arranged for operation relatively with the flasksections, substantially as specied.

CHARLES C: STEWART.

Witnesses A. G. SHAW, H. Hows. 

